`year` is not output in generated HTML page

[Takafumi Kanda]

Copyright years represented by year members in YAML are not output in generated licenses HTML page.

I have reproduced the issue with v1.1.0.

For example, following license definition should output Copyright © 2019, Square, Inc. All rights reserved. as the copyright notice.

- artifact: com.squareup.okhttp3:okhttp:+
  name: OkHttp
  copyrightHolder: Square, Inc.
  year: 2019
  license: The Apache Software License, Version 2.0
  licenseUrl: http://www.apache.org/licenses/LICENSE-2.0.txt
  url: https://github.com/square/okhttp

However, it actually output Copyright © Square, Inc. All rights reserved. which doesn't have year.

Note

YamlUtils seems to forget to parse year member.
https://github.com/cookpad/LicenseToolsPlugin/blob/1.1.0/plugin/src/main/java/com/cookpad/android/plugin/license/util/YamlUtils.kt#L9-L35